Calculate the number of photons in it

Reference no: EM13656591

a. A pulsed ruby laser emits light at 694.3 nanometer .Consider an 11.7 ps pulse containing 7.38 J of energy. Compute the physical length of the pulse as it travels through space. Planck's constant is 6.626 × 10-34 J • s and the speed of light is 3× 108 m/s.

Answer in units of mm.

b. Calculate the number of photons in it.

c. If the beam has a circular cross section of 0.316 centimeter diameter, calculate the number of photons per cubic millimeter.

Answer in unit's of mm-3.

Reference no: EM13656591

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